Improvement in coverings for steam-pipes, boilers



UNITED STATES PATENT OFFICE;

TRUMAN MERRIAM, OF MILWAUKEE, VWISOONSIN.

IMPROVEMENT IN COVERINGS FO R STEAM-PIPES, BOILERS, 80c.

Specification forming part of Letters Patent No. 156,710, dated November 10, 1874; application filed December 1, 1873.

To all whom it may concern:

Be it. known that I, TRUMAN MERRIAM, of Milwaukee, county of Milwaukee and State of Wisconsin, have invented a certain Improvement in Covering for Steam-Pipes, Boilers, Cylinders, or anything Where it is desirable to prevent the radiation of heat and exclude both cold and hot water, also frost, of which the following is a specification:

My invention relates to a certain compound for covering hair-felt on both sides, which is used in covering steam boilers, pipes, and water-pipes; also, on cloth or paper for roofing and other purposes; and it consists in uniting into one compound one gallon of pure clay, six gallons of soft Water, six gallons of prepared coal tar, one gallon of plaster-paris,

or sufficient to cut the tar. Mix the whole thoroughly together.

To prepare the coal-tar, say, take forty gallons of raw or common coal-tar; boil it until five gallons of oil pass off in steam or vapor, 

